Andy_Langton - 9:03 am on Mar 28, 2012 (gmt 0)
Google have been grabbing robots-excluded CSS and JS for years. They have a bot that pretends to be a browser to do this if, I remember my log files correctly.
So, not really sure why this announcement. I suppose it's related to the "headless browser" crawling strategy, and getting a visual idea of textual prominence, as opposed to the previous matching of potentially dubious techniques.
But it does seem a bit of an overstretch. Bandwidth isn't free!